Glass-polishing apparatus



1 Dec. 14, 1926. g c. H. CHRISTIE GLASS POLISHING APPARATUS Filed May 22, 1925 y, Y I MEQTORMI Y /o I v Patented 14. 1926.

UNITED'STATES PATENT OFFICE.

CHARLES H. CHRISTIE, F BUTLER, PENNSYLVANIA.

GLASS-POLISHING APPARATUS.

Application filed May 22, 1925. Serial No. 32,039.

which is commonlyemployed may be more conveniently applied and removed than in the case of polishing devices as heretofore 'employed' The polishing heads or blocks which are commonly employed and to which the felt brother polishing material is secured, weigh from I00 to 200 pounds. .It has therefore been deemed necessary to so fasten the felt .to the blocks that the block must be removed Whenever it becomes necessary to replace a worn felt or one that has foreign matter imbedded thereinwhich is scratching the glass. In order to effect the replacement,

.it is necessary that two men be employed to remove the block containing the worn felt. This is generally accomplished by pulling a cotter pin out of the support or bar that carries the block. the other end of which bar is connected to the rotatable spider that carries the polishing blocks. The workmen then lower the heavy block out of its operative position and insert a block having a new felt or pad. The grinding table which has theretofore been removed may then bewheeled or carried into place beneath thepolishing heads.

The foregoing operations require considerable time and labor and involve the expenditure of considerable money for additional polishing blocks that must be kept in stock in order that a number of blocks with unworn pads may be held in reserve as replacements. Furthermore, by the old practice, anywhere from five to fifteen minutes have been required in order to change the polishing blocks, depending upon the character of the installation.

By the employment of my invention.

7 handling of the heavy grinding blocks is avoided, since I provide a pad support weighing only 25 to 30 lbs, which may be readily applied to and removed from the polishing block, by a single workman, and within one or two minutes of time. Therefore. not only'is the large expenditure of surplus heads avoided, but there is a saving in labor and in the time within which the polishing machine is idle while changes are being made.

One form which my invention may take is shown in the accompanying drawing, wherein Fi 1 is a vertical sectional view of a polishing block embodying my inven tion; Fig. 2 is a plan view thereof; Fig. 3 is a view taken on the. line 3-3 of Fig. 2, and Fig. 4 is a detail viewof a locking pin which I employ.

*I have shown my invention as embodied in a polishing block 5, preferably of cast iron, that is supported upon a stem 6.

Usually a plurality of blocks and their stems are mounted upon a. rotatable spider or polishing head and are bodily moved in annular paths about the center of rotation of the spider or cam, to polish glass that is moved beneath the same. In operation the block 5 has idle rotative movement about its stem 6, by reason of its frictional engagement with the glass surface being polished.

The block 5 is connected to its stem 6 .by means of a follower plate 7 of cast iron or the like which holds the central recessed portion of the block 5- against the ball-like lower end of the stem 6. The plate 7 is held in position by bolts 8 whose heads are supported in T-slots 9 in the block 5.

A polishing pad 10 of felt or similar material is provided and is removably applied to the block 5 by reason of the fact that it is held in clamping engagement with a removable ring 11, by means of an annular band 12. The pad 10 is assembled with said band and ring by placing one of said members beneath and the other above the felt and forcing them into concentric relation, thus bending the edges of the felt to the position shown in Fig. 1. The parts 10, 11 and 12 thus form a unit that is detachably secured to the polishing blocks 5 by means of a screw stud 13 threaded into said block and having its outer end extending into a recess formed in the ring 11. Diametrally opposite to the stud 13, the block 5 is provided with a recess 14, and a hole 15 within which is contained a locking pin 16. As shown in the drawing, one end of the locking pin extends through the opening 15 into a hole in the ring 11, the other end of the pin 16 lying in the recess 14 may then be dropped and the ring with its contained pad 10 and the band 11 moved to the right to clear the stud 13.

It will be seen that the polishing block need not be disturbed and that it is only necessary to carryextra pads and bands 11 and 12 in assembled condition in order to quickly replace worn pads. Frequent changes are also required because chips of glass or foreign matter become imbedded in the felt.

An annular flange 18 is provided on the block to prevent the lubricant which is suplied at the lower end of the stem 6 from eing carried across the top of the block to the pad and thence to the polishing surface.

I claim as my invention:

1. Glass polishing structure comprising an annular block, a ring-like member adapted to loosely surround said block. a polishing pad, means for securing said pad to said ring-like member, comprising a band disposed concentrically of said member and seving to clamp the pad against the same,

and means for detachably securing said ring-like member to the block.

2. Glass polishing structure comprising angles to its body portion and held between said concentric members.

4:. Polishing apparatus comprising a polishing block, a holding lug n one edge of.

the block, a movable locking bar supported in spaced relation to said lug, a poh'shin pad having its peripheral portion upturnec, and a pair of concentric ring-like members between which said peripheral portion is clamped, one of the said ring-like members lbeing releasably supported by said lug and 'ar.

In testimony whereof I, the said CHARLI'IS H. CHRISTIE have hereunto set my hand.

CHARLES H. CHRISTIE. 

